Sea Challengers Natural History Books is a small, personalized family business owned and operated by David and Diana Behrens. Sea Challengers offers over 250 titles on natural history books, marine life books, underwater marine life books, marine mammal books, invertebrate books, plant & algae books, marine life books, marine fish books, marine ecology books, marine biology books for the Universities, libraries, student and the marine biologist, we also offer underwater identification guides for the SCUBA diver, and the underwater photographer. Please visit our website at www.seachallengers.com for a complete list of our titles, we also feature a different book each month at a 20% discount.>